Cruiser-sized Freighter with combat capabilities... well, yeah, the Apogee, which can carry cargo
and survive a nuclear holocaust
and kill way more than its weight in CR and DP. Anything else? Seriously? No.
Burn of 7 means the Venture is worthless. Not "marginal"- just junk. Do not buy a Venture unless you feel sorry that its cool sprite isn't seen in the game enough.
Does the game need a "combat freighter" in the larger size classes? Yes, it should have one; the Venture is supposed to be that ship, but, due to the inexplicable nerf to its Burn and other core stats, isn't; I guess it's not clear how important that stat is or what fleet the Venture is meant to roll with, because it's
not a fleet that includes Capitals or other Cruisers, and not a fleet where it's just eye-candy on the Fleet screen.
The Atlas should have a less-efficient likeness that is beefy enough to be used in combat, sure; something very slow, very armored, but well-armed, that can snipe things and defend itself from missiles.
The Atlas itself isn't sensible, given the violence of the SS universe, and should get a revamp; it's basically the definition of "ship I will shoot down every time I see it, if I'm fighting a Faction and shooting down an Atlas means the Faction lost an expensive vessel and a lot of cargo".
If there's ever a real-deal connection between fleets being built with money, economies and cargoes, the Atlas is the low-hanging fruit and prime strategic target, basically, because if I defeat the escort fleet, the Atlas is always going to go down, whereas some of the other pure Freighters might, in theory, survive.
A Mule offers about as much combat power as a single Lasher
Not even close.
A Mule gets more kick out of ITU and it also has one of the very few Medium Energy mounts on a central turret with a halfway-decent arc, coupled with an efficient shield that's very effective when converted to Frontal. It's a very capable combat ship against anything in the Destroyer class in late-game play, and groups of Mules can kill Capitals with surprising ease. The efficiency of the Pulse Laser does it; they don't need missiles and they're very hard to take down with Tech buffs, Vents and level-10 Power Grid.
Lashers largely just eat space dust at that point in the game because of their terrible shield efficiency, slow speed and lower range bands. I don't bother using them past early game any more. They used to be decent combat sluggers, but somewhere along the way they got nerfed too hard.